<template>
  <div class="todo-header">
    <input 
			type="text" 
			placeholder="请输入你的任务名称，按回车键确认" 
			@keyup.enter="handleAdd"
		/>
  </div>
</template>

<script>
import { nanoid } from 'nanoid'

export default {
  name: "Header",
	props:['addTodo'],
	methods: {
		handleAdd(e){
			//1.获取用户的输入
			let {value} = e.target
			// 2.校验用户的输入
			if(value.trim()){
				//把用户的输入包装成一个todo对象
				let todoObj = {
					id:nanoid(),
					title:value.trim(),
					done:false
				}
				//调用App传递过来的addTodo，去实现添加
				this.addTodo(todoObj)
			}else{
				alert('输入不能为空！')
			}
			//清空用户输入
			e.target.value = ''
		}
	},
};
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>